Measurement and calibration

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REMOTE MEASUREMENT: ONE CAMERA. UP TO 8 METERS. HR OVER 200. VITAL SIGNS FROM VIDEO. 500 CHARACTERS REMOTE MEASUREMENT: ONE CAMERA. UP TO 8 METERS. HR OVER 200. VITAL SIGNS FROM VIDEO. REDTEL measures vital signs contactlessly at a… 28.08.2026
Why Wearables Only Measure Part of the Picture – and Algorithms Cannot Recover the Rest Wearables never see the whole physiology. Some information is missing because its relevance is unknown; other information is lost to technical… 15.08.2026
HRV Measured with Light: The Individual Value May Be Wrong – But the Trend Is Supposed to Be Right? Short text – approx. 500 characters “The individual value doesn’t have to be exact. What matters is the trend.” But why should a trend solve the… 14.08.2026
Testing Wearables: Is the Reading Really Your Heart Rate – or Just Plausibly Calculated Motion? Short text – approx. 500 characters A wearable can display a perfectly plausible value – and still be analysing the wrong signal. Especially during… 14.08.2026
Wearables in Motion: Good Software Starts with a Good Signal – Hardware Determines What Can Be Calculated at All Short text – approx. 500 characters A motion artefact is not primarily a software error – it is physics. Movement can overlay the weaker optical… 14.08.2026
HRV IN WEARABLES: 1000 ms — BUT 1000 ms OF WHAT? Same unit. Different measurement path. Different meaning. ECG measures intervals between heart events. PPG measures intervals between arriving pulse… 12.08.2026
Wrist and Finger Do Not Measure HRV: Between Heart and Sensor Lie Blood Pressure, Transit Time and Pulse Pressure Rhythm Short Text up to 500 characters A watch or ring does not measure the electrical heart action. It measures blood-pressure-dependent trend data in the… 11.08.2026
Why PWV Is Not Simply HRV: Without Blood Pressure, Pulse Wave Variability Remains an Unclear Millisecond Variance Short Text up to 500 characters Wearables usually do not measure the electrical heart action directly. They measure the arrival of the pulse wave at… 10.08.2026
Can a wearable evaluate sleep, stress, recovery, or health using only one of many parameters? Short text (approx. 500 characters) Many wearables assess sleep, stress, or recovery primarily from heart rate variability (HRV). However… 31.07.2026
Three Non-Invasive Verification Principles for Blood Pressure-Dependent Trend Data It is not the individual value that matters—it is the reproducible change between two defined physiological states. The verification of blood pressure-dependent trend data requires a different approach than evaluating a single blood pressure value. An individual… 26.07.2026
Proposal for Verifying the Functional Performance of Wearables Transparent. Reproducible. Verifiable. Calibration, functional verification, and stress testing serve different purposes and should not be treated as the same process. Reliable… 25.07.2026
The Tilt Table Gives Wearables Feedback. Subtitle A defined change in body position creates a defined physiological response. Only devices that show this response in real time allow their… 24.07.2026